*{
    margin: 0;
    padding: 0;
}
li{
  list-style: none;  
}
ul{
    width: 100%;
    height: 40px;
}
ul>li{
    float: left;
    height: 40px;
    line-height: 40px;
    margin: 0 15px;
}
ul>li>a{
    box-sizing: border-box;
    padding: 5px 0;

}

ul .current>a{
    color: red;
}
ol li{
    display: none;
}
ol .current{
    display: block;
}

/* 表格样式 */
table{

}
table tr{
    height: 30px;
}
table tr:nth-child(even){
    background-color: gray;
}
table tr:nth-child(odd){
    background-color: green;
}
table tr:first-child{
    background-color: #fff;
}

table td,table th{
    min-width: 40px;
    text-align: center;
    border: 1px solid red;
    padding: 0 20px;
}